To remove all the elements from the CopyOnWriteArrayList, use the clear() method. It empties the list.The syntax is as follows:void clear()To work with CopyOnWriteArrayList class, you need to import the following package:import java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class clear() method in Java:Example Live Demoimport java.util.concurrent.CopyOnWriteArrayList; public class Demo {    public static void main(String[] args) {       CopyOnWriteArrayList arrList = new CopyOnWriteArrayList();       arrList.add(220);       arrList.add(250);       arrList.add(400);       arrList.add(500);       arrList.add(650);       arrList.add(700);       arrList.add(800);       System.out.println("CopyOnWriteArrayList String Representation ... Read More

The AbstractSequentialList class has the add(int index, E ele) method to add element to the specific position. You can also use the add() method inherited from AbstractList class.add(int index, E ele) methodThe syntax is as follows:add(int index, E ele)Here, index is where the element is to be inserted. The ele is the element to be inserted.To work with the AbstractSequentialList class in Java, you need to import the following package:import java.util.AbstractSequentialList;The following is an example to implement AbstractSequentialList add() method in Java:Example Live Demoimport java.util.LinkedList; import java.util.AbstractSequentialList; public class Demo {    public static void main(String[] args) {       ... Read More

The insertRow() method of the ResultSet interface inserts a new row into the ResultSet object as well as the table.//Deleting a column from the ResultSet object rs.insertRow();Assume we have a table named cricketers_data with 6 records as shown below:+----+------------+------------+---------------+----------------+-------------+ | ID | First_Name | Last_Name  | Year_Of_Birth | Place_Of_Birth | Country     | +----+------------+------------+---------------+----------------+-------------+ | 1  | Shikhar    | Dhawan     | 1981-12-05    | Delhi          | India       | | 2  | Jonathan   | Trott      | 1981-04-22    | CapeTown       | SouthAfrica | | ... Read More

To set key in the JavaTuples KeyValue class, you need to use the setKey() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is an example to set ... Read More

To fetch the key from a KeyValue tuple in Java, use the getKey() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is an example to fetch the ... Read More

The getRow() method of the ResultSet class returns the row number at which the ResultSet pointer exists in the current instance.Assume we have a table named cricketers_data with 6 records as shown below:+------------+------------+---------------+----------------+-------------+ | First_Name | Last_Name  | Date_Of_Birth | Place_Of_Birth | Country     | +------------+------------+---------------+----------------+-------------+ | Shikhar    | Dhawan     | 1981-12-05    | Delhi          | India       | | Jonathan   | Trott      | 1981-04-22    | CapeTown       | SouthAfrica | | Lumara     | Sangakkara | 1977-10-27    | Matale     ... Read More

To fetch the value from a KeyValue tuple in Java, use the getValue() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is an example to fetch the ... Read More

To create KeyValue tuple from List collection, use the fromCollection() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is an example to create KeyValue Tuple from List ... Read More

The absolute() method of the ResultSet interface accepts an integer value representing the index of a row and moves the ResultSet pointer of the current ResultSet object to the specified position.Assume we have a table named cricketers_data with 6 records as shown below:+------------+------------+---------------+----------------+-------------+ | First_Name | Last_Name  | Date_Of_Birth | Place_Of_Birth | Country     | +------------+------------+---------------+----------------+-------------+ | Shikhar    | Dhawan     | 1981-12-05    | Delhi          | India       | | Jonathan   | Trott      | 1981-04-22    | CapeTown       | SouthAfrica | | Lumara   ... Read More

The average() method of the DoubleStream class in Java returns an OptionalDouble which is the arithmetic mean of elements of this stream. If the stream is empty, empty is returned.The syntax is as follows:OptionalDouble average()Here, OptionalDouble is a container object which may or may not contain a double value.To use the DoubleStream class in Java, import the following package:import java.util.stream.DoubleStream;First, create DoubleStream and add some elements:DoubleStream doubleStream = DoubleStream.of(50.8, 35.7, 49.5, 12.7, 89.7, 97.4);Get the average of the elements of the stream:OptionalDouble res = doubleStream.average();The following is an example to implement DoubleStream average() method in Java:Example Live Demoimport java.util.*; import java.util.stream.DoubleStream; ... Read More